Merged PR 147834: Fixing RL.exe buffer too small AV.

Fixing RL.exe buffer too small AV.

While updating the cmd title we can buffer overflow. Fixed that by breaking the loop if we exceeding the
buffer.

Author: akroshg

bin/rl/rl.cpp

@@ -4620,7 +4620,13 @@ UpdateTitleStatus()
    // start at 1: skip primary thread 0 (unless we decide to let it do real work)
    for (i = 1; i <= NumberOfThreads; i++) {
       ThreadInfo[i].GetCurrentTest(tempBuf);
-      s += sprintf_s(s, REMAININGARRAYLEN(TitleStatus, s), "; %s", tempBuf);
+      size_t remainingCount = REMAININGARRAYLEN(TitleStatus, s);
+      size_t testLen = strnlen_s(tempBuf, BUFFER_SIZE);
+      // Accounting for formatting string and endofbuffer char.
+      if ((testLen + 3) >= remainingCount) {
+          break;
+      }
+      s += sprintf_s(s, remainingCount, "; %s", tempBuf);
    }
 
    LeaveCriticalSection(&csTitleBar);